Graphene-based tunable metamaterial terahertz filters
Graphene-based tunable metamaterial terahertz filters
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DOI：
10.1063/1.4894807
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发表时间：
2014-09-01
影响因子：
4
通讯作者：
Sensale-Rodriguez, Berardi
中科院分区：
文献类型：
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作者：
Yang, Kai;Liu, Shuchang;Sensale-Rodriguez, Berardi
我们提出并描述了一种基于石墨烯的微机械可调谐超材料太赫兹滤波器。该器件结构由周期性金属环组成，具有几个间隙，其中可调石墨烯条位于间隙中。我们证明，滤波器的谐振频率可以很容易地通过改变石墨烯的导电性来调整，并通过改变堆叠的石墨烯层的数量来实现这一点。此外，所提出的设计是可缩放的，在这个意义上，可以通过缩放金属环的内半径和外半径来控制谐振频率调谐。使用数值模拟和制造样品的太赫兹时域光谱测量，我们表明该结构的谐振频率可以改变40%（即，从类似于0.2THz到类似于0.12THz）。重要的是，该器件的有效面积是
We propose and describe a micro-machined tunable metamaterial terahertz filter based on graphene. The device structure consists of periodic metallic rings with several gaps where tunable graphene stripes are located. We demonstrate that the filter resonance frequency can be adjusted easily by varying the conductivity of graphene and implement this by changing the number of stacked graphene layers. Moreover, the proposed design is scalable, in the sense that the resonance frequency tuning can be controlled by scaling the inner and outer radius of the metal rings. Using numerical simulations and terahertz time-domain spectroscopy measurements of the fabricated samples, we show that the resonance frequency of the structure can be altered by 40% (i.e., from similar to 0.2 THz to similar to 0.12 THz) by simply tuning the conductivity of graphene. Importantly, the active area of the device is